Operator-supported power drill



April 3, 1951 E. P. GOULD OPERATOR-SUPPORTED POWER DRILL 2 Sheets-Sheet 1 iled Nov. 2, 1946 .Zi ereii P. 60:12 (i E. P. GOULD 2,547,818

OPERATOR-SUPPORTED POWER DRILL April 3, 1951 Filed Nov. 2., 1946 2 Sheets-Sheet 2 Inventor flu I W] Inez-e22 P. fiazzld Patented Apr. 3, 1951 UNITED STATES PATENT OFFICE 2,547,818 v OPERATOR-SUPPORTED POWER-DRILL Everett P. Gould, Hebron, N. Y.

Application November 2, 1946, Serial No. 707,416

3 Claims.

My invention relates to powerdrills and more particularly to a portable drill especially designed for tapping trees and equipped with novel structure rendering the drill suitable for this purpose.

One object of this invention is to provide such a device with a completely independent power unit housed in a light weight frame which is easy to handle.

Another object of this invention is to improve the frame structure of such devices to provide adequate rigidity of the different parts of the structure by the use of side braces which also serve as clothing guards making the device particularly safe to use.

Another object of this invention i to provide a sensitive feed control for the engine, this being done by controlling the governor rather than the throttle and by controlling the actual rotational speed of the drill rather than the amount of power delivered by the engine.

And a last object to be specifically mentioned here is to provide such a device with convenient means for providing a choice Of two speeds for the drill.

With these and other objects in view as will appear hereinafter, this invention consists of certain novel features of construction, combination and arrangement of parts as will hereinafter be described in detail and particularly set forth in the appended claims, reference being had to the accompanying drawings which form a material part of this application and in which:

Figure 1 is a perspective view of my invention, being held in operative position against a tree.

Figure 2 is a top plan view Of my invention.

Figure 3 is a. side elevational view of my invention, showing in dash lines the position of a shaft and chuck when the device is adapted for high speed operation.

Figure 4 is a front elevational view of this invention.

Figure 5 is a fragmentary detail view, sectional in character, to illustrate a preferred method of attaching the shaft and chuck so as to be easily removable and insertable, as indicated in the second position in Figure 3.

Similar characters of reference refer to similar or identical parts throughout the several views of the drawings.

As shown in the drawings a base plate In is made integral with a pair of upright members l2, curved at one end thereof as at l4 1and provided with pads Hi to comprise a comfortable shoulder harness by which the power drill can be supported and. carried. The pad member I6 may extend completely across the back, that is, behind the shoulders, if desired. A plurality of breast straps 20, transversely disposed to and rigidly secured to said upright members I2, assist in effectively distributing the weight of the device assuringgreater comfort to the user of the drill.

At the forward end of the base plate I0 there are provided two uprights 22 and 24, arranged in parallel spaced relation and of approximately the same height. A cross brace 26 is secured between these two uprights, and laterally disposed braces 28 and 38 are secured between the base and the upright member l2 and the upright 22 respectively, these side braces having a second very important function in that they prevent the clothing of the operator being caught in any portion of the mechanism. a r

A gasoline engine 32 of suitable size, weight and power, is mounted substantially centrally of the base plate l0, and is provided with a power takeoff pulley 34 which will normally be adapted to receive a belt 36 and this belt will be used to drive a second larger pulley 38 removably secured on the shaft 40 by a set screw 42, the shaft 40 being mounted in bearings 44 and 46 in the uprights 24 and 22 respectively.

Two collars 48 and 58, provided with set screws 52 and 54, are placed on the shaft 40 between the two uprights 24 and 22, to abut the bearings 44 and 46 respectively, and thereby receive end thrust of the shaft 40.

For high speed operation of the drill the set screws 42, 52 and 54 are loosened and the shaft 48 is withdrawn from the bearings 44 and 46 and inserted through'bearings 56 and 58, these last mentioned bearings being similar inevery respect to the bearings 44 and 46 except that these bearings are located near the base of the uprights 24 and 22 so as to be co-linear with the power takeoff pulley 34. To facilitate this change of the position of the shaft 40 the end of the shaft may be squared or hexed and the pulleys 38 and 34 may have square or hexed axial sockets to receive this end of the shaft. It will be noted in this connection, that when the shaft 48 is moved into the second position, the collars 48 and. 50 will also be moved into a new position to prevent longitudinal movement of the shaft 48, but the pulley 38 and the belt 36 may be removed from the machine, advantage of lessened weight thus being achieved.

At the outer end of the shaft 40 a chuck 56 is secured and this chuck is adapted to receive a bit 58.

The cross brace 26 has integrally secured thereto two hand members 60 extending laterally of the machine and adapted to be grasped by the hands of the operator to steady the machine during the operation of drilling, and there has been incorporated with one of these hand members 60 a hand lever or finger lever 62, similar in character to the throttle control lever used on motorcycle handle bars. This lever 62 is adapted, by means of a flexible cable 64, to transmit a movement of the lever 62 to adjust the governor of the engine.

The method of operation of this machine will be obvious, but it may be pointed out that the sensitive speed control secured by the careful manipulation of the lever 62 makesthe starting of the drill considerably easier than in devices where the speed is not thus carefully controllable, and it should also be noted that the hands of the operator need not be moved during the whole operation of drilling a hole.

Another advantage which will now be evident is the provision of two speeds, making is possible to adjust the machine for use in drilling different materials, such as drilling holes in older and younger maple trees.

Though there has been shown a particular embodiment of this invention, this application is not limited to this particular embodiment, but it is desired to include in the scope of this invention the construction, combination and arrangement of parts substantially as set forth in the appended claims.

Having thus described this invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A portable power drill including a frame having a base plate, an upright with a bearing therein, a supporting harness comprising upwardly extending metal straps having curved upper end portions to hook over the shoulders of an operator and transversely disposed breast straps rigidly secured to said metal straps, said metal straps being rigidly secured to said base plate, an engine secured to said base plate, a power take-off pulley operatively connected to said engine, a shaft rotatively mounted in said bearing, a second larger pulley on said shaft end operatively connected to said power take-off pulley, laterally extending hand grips mounted on said upright to steady the drill while in use, and a chuck secured to the outer end of said shaft, said engine having a governor and a controlling lever operatively mounted on the side of one of said hand grips adjacent said breast straps, whereby the machine can be firmly supported by the operator while the controlling lever is being shifted.

2. A portable power drill including a frame having a baseplate, an inner upright with two bearings therein, an outer upright integral with said base plate and spaced from said inner plate with two corresponding bearings therein, a shoulder harness secured to said base plate, a gasoline engine secured on said plate, a power takeoff co-linear with one pair of said corresponding bearings and operatively connected to said engine, a pulley operatively connected to said take-01f and co-linear with the other pair of said corresponding bearings, a drill bit and chuck, and a shaft secured to said chuck and insertable through a pair of said corresponding bearings to selectively engage said power take-off and pulley.

3. A portable power drill including a frame having a base plate, an inner upright with two bearings therein, an outer upright integral with said base plate and spaced from said inner plate with two corresponding bearings therein, a shoulder harness secured to said base plate, a gasoline engine secured on said plate, a power take-off co-linear with one pair of said corresponding bearings and operatively connected to said engine, a pulley operatively connected to said take-off and co-linear with the other pair of said corresponding bearings, a single chuck for a drill bit, and a shaft secured to said chuck and selectively insertable through a pair of said corresponding bearings to selectively engage said power take-01f and pulley, said uprights having a transverse cross brace spaced above said base plate, and said cross brace having lateral extensions to comprise a pair of hand grips for steadying the drill while in use.

EVERETT P. GOULD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

